From rpetrov@illinois.edu Tue Dec 10 02:45:03 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!rpetrov From: rpetrov@illinois.edu (Rodrigo Petrov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec10.024503.2841@illinois.edu> Date: Tue, 10 Dec 1996 02:45:03 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Rodrigo Petrov "Row 14. No joke." Acorn RiscPC 600 / AmigaOS 3.1 From rrobertson@panix.com Wed Dec 11 18:19:03 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!rrobertson From: rrobertson@panix.com (Renata Robertson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec11.181903.5793@panix.com> Date: Wed, 11 Dec 1996 18:19:03 GMT References: <1996Dec10.024503.2841@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Dec10.024503.2841@illinois.edu>, rpetrov@illinois.edu (Rodrigo Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Renata Robertson Tape trading list upon request. SASE required for international mail. From rstewart@rwth-aachen.de Thu Dec 12 06:32:03 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!rstewart From: rstewart@rwth-aachen.de (Rodrigo Stewart) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec12.063203.6648@rwth-aachen.de> Date: Thu, 12 Dec 1996 06:32:03 GMT References: <1996Dec10.024503.2841@illinois.edu> <1996Dec11.181903.5793@panix.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Dec11.181903.5793@panix.com>, rrobertson@panix.com (Renata Robertson) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Rodrigo Stewart US Robotics Courier V.34 @ 28,800 bps "Measuring a record you own is listening, not piracy." From bmartinez@delphi.com Fri Dec 13 02:03:03 1996 Path: ashpoly!cascade!bigsur!delphi!bmartinez From: bmartinez@delphi.com (Brian Martínez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec13.020303.4607@delphi.com> Date: Fri, 13 Dec 1996 02:03:03 GMT References: <1996Dec10.024503.2841@illinois.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Dec10.024503.2841@illinois.edu>, rpetrov@illinois.edu (Rodrigo Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Brian Martínez -- Delphi Internet Services "They will send a copy in my place." From klarsson@illinois.edu Fri Dec 13 14:55:03 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!klarsson From: klarsson@illinois.edu (Kirsty Larsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec13.145503.1636@illinois.edu> Date: Fri, 13 Dec 1996 14:55:03 GMT References: <1996Dec10.024503.2841@illinois.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Dec10.024503.2841@illinois.edu>, rpetrov@illinois.edu (Rodrigo Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Kirsty Larsson -- University of Illinois Urbana-Champaign "A soul is not exclusive to biology."